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The hyf operon upstream DNA. The putative consensus sequences for the CRP, FNR, Fur, and FhlA/HyfR proteins are enclosed by rectangles. A possible stem-loop between the stop codon of the upstream bcp gene and hyf promoter is shown in boldface type. The transcription start site is in reverse type. The −12 and −24 positions are also in shown in boldface type. A putative start codon for hyfA is both underlined and enclosed within a rectangle.
